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S G D Color Spot, Inc. 7 March 28, 1989 DRAFT (88168A) r ` TABLE 1 SOIL SAMPLE ANALYTICAL RESULTS (in ppm) Sample Depth Ethyl- Total Number (feet) Benzene Toluene benzene Xylenes TPH Identification 1S 12 <0.25' <0.25 y y 690 NA' 1N 12 <0.025 <0.025 <0.025 <0.025 <10 NA 2-1 Comp. Surface <0.25 0.84 3 2 12.0 1100 NA V Action Levels 0.0013 0.103 0.683 1.753 1004 ` 1 The less than (<) symbol denotes not detected at or above the detection limit identified. z Not available 3 Department of Health Services (DOHS) Sanitary Engineering Branch, Applied Action Levels for Drinking Water (DWS) effective February 25, 1989). 4 Leaking Underground Fuel Tank (LUFT) Manual Action Level for Moderate Leaching Potential. Underlined Number, Exceeds Action Level ` The analytical results indicate that the soils in the contaminated soil pile and the south end of the UST excavation are contaminated with toluene, ethylbenzene and total xylenes (TEX), and TPH in excess of applicable action levels. Also, the detection limits used by the laboratory for benzene (0.025 or 0.25 ppm) are significantly above the action level (0.001 ppm), therefore, benzene contamination in excess of the action level could also, unknowingly, exist. The laboratory was queried regarding the identification of the TPH (fuel fingerprint). Laboratory personnel reviewed the chromatograms but they were not able to identify the type of fuel(s) present. They indicated that it may have been a mixture of gasoline and diesel fuel. CONCLUSIONS AND RECOMMENDATIONS Based on the results of the field observations conducted during the UST removal and the analytical results (refer to Table 1), we conclude that inadvertent releases of product have occurred from the UST or its appurtenant piping, or by overspillage caused by overfilling of the tank. Because the UST appeared to be structurally sound, the most likely sources of the contamination are overspillage and piping leaks. The contamination appears to be limited to L